Piston



April 1930- H. MALLOY 1,752,994

PISTON Filed May 10, 1928 INVENTOR v W a /v WM WM A TTORNEY PatentedApr. 1,1930

UNETED STATES PATENT OFFKZE HOWARD MALLOY, F ALMA, MICHIGAN PISTONApplication filed May 10, 1928. Serial No. 276,604.

This invention relates to pistons and has and finished, and when thepiston is assemspecial references to a built up piston, such as bled, isadapted to seat in and fit a depression used in internal combustionengines, which 11 formed in the core 12 and which is turned when thehead and side walls thereof are to receive it, said core being alsocentrally worn, burned, scored, or for any reason unbored as shown at 13to accommodate the satisfactory and unfit, can be easily and lowerthreaded end of the bolt 9, the lower quickly removed, and a new headsubstituted end of said opening being counterbored to retherefor, with aminimum of time and labor. ceive a washer 14, together with a nut 15,and

The prime object of the invention is to deby means of which shell isrigidly secured on 19 sign a built up piston, which when assembled thecore.

and connected, provides a rigid and solid Spaced apart downwardlydepending legs unitary structure, and from which the outer 16 are castintegral with the core, and are shell can be readily removed. suitablybored to form bearings for the con- Generally where a piston is burned,scored, necting rod pin (not shown), diametrically or for some otherreason unfit for service, the it lugs 17 being also cast integralthereentire structure must be discarded, with my with, and are drilledand threaded to re- 7 improved construction the thin outer shell c iv ths r w 18 whi h secure th h t only need be discarded, and this can beremetal plate 19 in position, this plate covering moved by unskilledlabor by use of a common a d h ldi th t 15 f di l t;

29 screw driver. when the bolt 9 is removed. I wish to direct 70 lViththe above and other Objects in Vi w, particular attention to the factthat the nut the present invention consists in the cornbina- 15 i tsubje t d t th fir a d h at f th tion and arrangement of parts, hereinafe explosions, and oil from the engine crank case more fully described,illustrated in the accomis continuou ly plashing on the nut, consepanyng drawing, and part cu a y po quently the bolt can be readily removed.

out in the appended claim, it being u l From the foregoing descriptionit will he stood that changes may be made in the form, obvi u that I hap rf t d a very i l SiZB, p p and minor details of 0011- and practicalbuilt up piston, the head of Sanction, Without departing from the Spiritwhich is self centering, and which can be very so or sacrificing any ofthe advantages of the cheaply manufactured'and assembled. 8G

invention. What I claim is In the drawing: A piston comprising a coreformed with Fig. 1 is a part sectional Sid Vi w s wi g a centrallydisposed depression, and spaced the piston assembled. apart legs havingbearings formed therein, a

Fig. 2 is 1 BOP pl n VleW- self centering shell mounted on said core,and Fig. 3 is a Verti l Se -1 1ml VleW 0f the formed with a centrallydisposed conical shell. shaped shoulder adapted to snugly fit in saie g-4 is an lnVelted P View Of the depression, a bolt for securing the shellon sembled piston. the core, the lower end of said core being Referringnow to the drawing in Which I counterbored to accommodate a lock washerhave shown the Preferred embodiment of y and nut, and a plate detachablysecured to invention, the numeral 5 indicates the head th Core fpreventing di l t f id and shell of the piston, which is provided t withpiston ring grooves 6 in the usualman- I testimony whereof I hereuntoafi in my 15 ner, and is further formed with a centrally i t 9 disposedopening 7, counterbored as shown at HOWVARD MALLOY 8, to receive thebolt 9.

An inwardly projecting conical shaped shoulder 10 is cast integral withthe shell, the

outer surface of the shoulder being turned V is.

